Cannot start keycloak radius because sonatype requests authorization

[ffried]

Describe the bug
When launching keycloak, the installation fails due to sonatype requesting authorization.
(e.g. https://repository.sonatype.org/service/local/artifact/maven/content?r=central-proxy&g=com.github.vzakharchenko&a=rad-sec-plugin&e=jar&v=1.4.9)

To Reproduce
Steps to reproduce the behavior:

1. Launch keycloak docker container with radius plugin.
2. See logs

Expected behavior
The container starts.

[ffried]

Note: The logs actually say something about an invalid ZIP - which is because the zip contains the 403 response from sonatype:

ERROR: Failed to run 'build' command.
ERROR: java.io.IOException: Failed to create a new filesystem for /opt/keycloak/lib/../providers/rad-sec-plugin.jar
ERROR: Failed to create a new filesystem for /opt/keycloak/lib/../providers/rad-sec-plugin.jar
ERROR: zip END header not found
For more details run the same command passing the '--verbose' option. Also you can use '--help' to see the details about the usage of the particular command.